/*
 * Copyright 2012 The jASN1 Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except
 * in compliance with the License. You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License
 * is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
 * or implied. See the License for the specific language governing permissions and limitations under
 * the License.
 */
package com.beanit.iec61850bean.internal;

import com.beanit.asn1bean.ber.BerLength;
import com.beanit.asn1bean.ber.BerTag;
import com.beanit.asn1bean.ber.ReverseByteArrayOutputStream;
import com.beanit.asn1bean.ber.types.BerType;

import java.io.*;

public class BerBoolean implements Serializable, BerType {

    public static final BerTag tag =
            new BerTag(BerTag.UNIVERSAL_CLASS, BerTag.PRIMITIVE, BerTag.BOOLEAN_TAG);
    private static final long serialVersionUID = 1L;
    public boolean value;
    private byte[] code = null;

    public BerBoolean() {
    }

    public BerBoolean(byte[] code) {
        this.code = code;
    }

    public BerBoolean(boolean value) {
        this.value = value;
    }

    @Override
    public int encode(OutputStream reverseOS) throws IOException {
        return encode(reverseOS, true);
    }

    public int encode(OutputStream reverseOS, boolean withTag) throws IOException {

        if (code != null) {
            reverseOS.write(code);
            if (withTag) {
                return tag.encode(reverseOS) + code.length;
            }
            return code.length;
        }

        int codeLength = 1;

        if (value) {
            reverseOS.write(0x01);
        } else {
            reverseOS.write(0);
        }

        codeLength += BerLength.encodeLength(reverseOS, codeLength);

        if (withTag) {
            codeLength += tag.encode(reverseOS);
        }

        return codeLength;
    }

    @Override
    public int decode(InputStream is) throws IOException {
        return decode(is, true);
    }

    public int decode(InputStream is, boolean withTag) throws IOException {

        int codeLength = 0;

        if (withTag) {
            codeLength += tag.decodeAndCheck(is);
        }

        BerLength length = new BerLength();
        codeLength += length.decode(is);

        if (length.val != 1) {
            throw new IOException("Decoded length of BerBoolean is not correct");
        }

        int nextByte = is.read();
        if (nextByte == -1) {
            throw new EOFException("Unexpected end of input stream.");
        }

        codeLength++;
        value = nextByte != 0;

        return codeLength;
    }

    public void encodeAndSave(int encodingSizeGuess) throws IOException {
        ReverseByteArrayOutputStream os = new ReverseByteArrayOutputStream(encodingSizeGuess);
        encode(os, false);
        code = os.getArray();
    }

    @Override
    public String toString() {
        return "" + value;
    }
}
